Derivatives (Schedule of Non-designated Hedges Outstanding) (Details)	12 Months Ended
	Dec. 31, 2020 $ / Unit MMBTU MMBoe bbl
Natural gas | Basis Swap | NGPL Texok | Jan'21 - Dec'21
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBTU	30,000
Swap price	(0.215)
Natural gas | Swap | If Nymex | Jan'21 - Oct'21
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBTU	50,000
Swap price	2.818
Natural gas | Swap | If Nymex | Nov'21 - Dec'21
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBTU	45,000
Swap price	2.900
Natural gas | Swap | If Nymex | Jan'22 - Dec'22
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBTU	5,000
Swap price	2.605
Natural gas | Swap | If Nymex | Jan'23 - Dec'23
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBoe	22,000
Swap price	2.456
Natural gas | Collar | If Nymex | Jan'22 - Dec'22
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Mmbtu) | MMBTU	35,000
Derivative, Floor Price	2.50
Derivative, Cap Price	2.68
Crude Oil | Swap | Wti Nymex [Member] | Jan'21 - Dec'21
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Bbl) | bbl	3,000
Swap price	44.65
Crude Oil | Swap | Wti Nymex [Member] | Jan'22 - Dec'22
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Bbl) | bbl	2,300
Swap price	42.25
Crude Oil | Swap | Wti Nymex [Member] | Jan'23 - Dec'23
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (Bbl) | bbl	1,300
Swap price	43.60